X0306 4 2017-03-03 0 0001378950 U.S. Auto Parts Network, Inc. PRTS 0001345543 WATANABE NEIL T 16941 KEEGAN AVENUE CARSON CA 90746 0 1 0 0 CHIEF FINANCIAL OFFICER Common Stock 2017-03-03 4 A 0 57303 0 A 77054 D Common Stock 2017-03-03 4 F 0 2304 3.35 D 74750 D In accordance with the Stock Unit Award Agreement dated January 21, 2016, the reporting person was granted 57,303 performance-based restricted stock units which vested 100% on March 3, 2017, the date the Compensation Committee determined that the performance metrics were met. These restricted stock units converted to common stock on a one-for-one basis upon vesting. Pursuant to the Stock Unit Award Agreement dated January 21, 2016, the Issuer elected to cancel and not issue vested shares to satisfy tax withholding obligations of the reporting person. David Eisler, as Attorney-in-Fact for Neil T. Watanabe 2017-03-07